US11529830B2 - Pneumatic tire with rim protector including plurality of recesses - Google Patents

Pneumatic tire with rim protector including plurality of recesses Download PDF

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Publication number
US11529830B2
US11529830B2 US16/704,474 US201916704474A US11529830B2 US 11529830 B2 US11529830 B2 US 11529830B2 US 201916704474 A US201916704474 A US 201916704474A US 11529830 B2 US11529830 B2 US 11529830B2
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Prior art keywords
recesses
tire
edge
region
circumferential direction
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US16/704,474
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US20200180360A1 (en
Inventor
Shingo Kuwano
Toshikazu Yasunaga
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Toyo Tire Corp
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Toyo Tire Corp
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Assigned to TOYO TIRE CORPORATION reassignment TOYO TIRE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUWANO, SHINGO, YASUNAGA, TOSHIKAZU
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/02—Seating or securing beads on rims
    • B60C15/024—Bead contour, e.g. lips, grooves, or ribs
    • B60C15/0242—Bead contour, e.g. lips, grooves, or ribs with bead extensions located radially outside the rim flange position, e.g. rim flange protectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
    • B60C13/02—Arrangement of grooves or ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
    • B60C13/002—Protection against exterior elements

Definitions

  • the present disclosure relates to a pneumatic tire.
  • a pneumatic tire has a tread, and beads, and has sidewalls arranged between the tread and the beads.
  • a rim protector is formed along the entire circumference at a portion of the sidewall that is located toward the exterior in the tire radial direction from the region contacted by the rim flange. It is often the case that the cross-sectional shape of the rim protector is trapezoidal or triangular, being the same every here along the entire circumference of the sidewall.
  • Japanese Patent Application Publication Kokai No. 2002-59712 discloses that arrangement of a plurality of recesses with spaces therebetween in the tire circumferential direction at a rim protector reduces the thickness of the rim protector and suppresses generation of heat, and that the recesses also cause increase in surface area and improvement in heat dissipation characteristics.
  • a pneumatic tire having a tread and a bead, a sidewall arranged between the tread and the bead, and a rim protector which is formed at the sidewall and which constitutes an annular protrusion that extends in a tire circumferential direction;
  • the rim protector has a first protruding edge which extends in the tire circumferential direction and which is toward an exterior in a tire radial direction, a second protruding edge which extends in the tire circumferential direction and which is toward an interior in the tire radial direction, a plurality of recesses arranged in the tire circumferential direction, and a plurality of ridges;
  • the plurality of ridges respectively connect the first protruding edge and the second protruding edge, and are respectively formed between pairs of the plurality of recesses that are adjacent in the tire circumferential direction;
  • each of the plurality of ridges comprises a first ridge that extends from the first protruding edge so as to be directed in a first direction in the tire circumferential direction to reach the second protruding edge, and a second ridge that extends from the second protruding edge so as to be directed in the first direction in the tire circumferential direction to reach the first protruding edge;
  • first ridges and the second ridges are arranged in alternating fashion along the tire circumferential direction.
  • FIG. 1 Tire meridional half-section showing an example of a pneumatic tire associated with a first embodiment
  • FIG. 2 Side view of tire showing rim protector in accordance with the first embodiment
  • FIG. 3 Partial enlarged view of FIG. 2
  • FIG. 4 Side view of tire showing rim protector in accordance with a second embodiment
  • FIG. 5 Partial enlarged view of FIG. 4
  • FIG. 6 Sectional view of section A 1 -A 1 in FIG. 5
  • pneumatic tire T is provided with a pair of bead regions 1 ; sidewall regions 2 which extend toward the exterior RD 1 in the tire radial direction from the respective bead regions 1 ; and tread region 3 which mutually connects the ends toward the exterior RD 1 in the tire radial direction of the sidewall regions 2 .
  • Arranged at bead region 1 are annular bead core 1 a at which steel wire or other such convergent body is coated with rubber, and bead filler 1 b which comprises hard rubber.
  • Bead region 1 is mounted on bead sheet 8 b of rim 8 , and provided that the air pressure is as it should be (e.g., air pressure as determined by JATMA)—is fitted in appropriate fashion to rim flange 8 a by virtue of the tire internal pressure, such that the tire is made to engage with rim 8 .
  • the air pressure is as it should be (e.g., air pressure as determined by JATMA)—is fitted in appropriate fashion to rim flange 8 a by virtue of the tire internal pressure, such that the tire is made to engage with rim 8 .
  • this tire is provided with toroidal carcass layer 4 which is arranged so as to span the distance between the pair of bead regions 1 and which extends from tread region 3 and passes through sidewall regions 2 to reach bead regions 1 .
  • Carcass layer 4 is made up of at least one carcass ply, and has end regions that are routed by way of bead cores 1 a to be retained in upturned fashion.
  • inner liner rubber (not shown) for retention of air pressure.
  • belt layer 5 Arranged at the outside circumferential surface of carcass layer 4 at tread region 3 is belt layer 5 which reinforces carcass layer 4 by virtue of the barrel hoop effect.
  • Belt layer 5 has two belt plies that have cords which extend so as to be inclined by prescribed angle(s) with respect to the tire circumferential direction, the respective plies being laminated together in such fashion that the cords thereof intersect in mutually oppositely inclined fashion.
  • belt reinforcing layer 7 Arranged toward the outside circumferential surface of belt layer 5 is belt reinforcing layer 7 , and arranged at the outside circumferential surface further in that direction therefrom is the tread rubber at which the tread pattern is formed.
  • rubber raw material for the aforementioned rubber layers and so forth natural rubber, styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), butyl rubber (IIR), and so forth may be cited, it being possible for any one of these to be used alone, or for any two or more of these to be used in combination.
  • rubber(s) may be reinforced with carbon black, silica, and/or other such tiller, and vulcanizing agent, vulcanization accelerator, plasticizer, antioxidant, and/or the like may be blended thereinto as appropriate.
  • rim protector 9 is formed at sidewall region 2 .
  • Rim protector 9 is arranged between the portion at which contact is made with rim flange 8 a and the portion Wh at which tire width is a maximum.
  • rim protector 9 constitutes an annular protrusion that extends in the tire circumferential direction CD.
  • the annular protrusion includes an outermost surface, a first sloping portion, and a second sloping portion.
  • the outermost surface is located at an apex of the annular protrusion in the tire width direction between a first edge and a second edge.
  • the first edge is adjacent to the second edge in a tire radial direction.
  • the first sloping portion extends from the first edge toward the tread region.
  • the second sloping portion extends from the second edge toward the bead region. While the cross-sectional shape of rim protector 9 is trapezoidal as viewed in the tire meridional section, there is no limitation with respect thereto, it being possible for example for the cross-sectional shape thereof to be triangular as viewed in the tire meridional section. As shown in FIG.
  • rim protector 9 has not less than two recesses 90 , 91 , 92 that are located within the outermost surface of the annular protrusion.
  • the recesses extend toward the tread region from a location toward the bead region in such fashion as to be directed toward a location in the second direction CD 2 from a location in the first direction CD 1 in the tire circumferential direction CD. It is preferred that depths of the respective recesses 90 , 91 , 92 be the same, and that these be not less than 0.5 mm but not greater than 3.0 mm.
  • the not less than two recesses 90 , 91 , 92 are arranged with spaces therebetween in the tire circumferential direction CD.
  • recesses 90 , 91 , 92 are indicated by hatching. Whereas there are three recesses 90 , 91 , 92 in the example shown in FIG. 2 and FIG. 3 , there is no limitation with respect thereto. It being sufficient that there be not less than two recesses, two, three, four, five, and six thereof may be cited examples. As shown in FIG. 3 , a mutually adjacent pair of recesses ( 90 , 91 ) ( 91 , 92 ) among the plurality of recesses 90 , 91 , 92 are in a positional relationship such that they partially overlap as seen when projected onto a virtual plane VF perpendicular to the tire radial direction RD. At the example of FIG.
  • the three recesses 90 , 91 , 92 constitute one group G. It is of course also possible to adopt a constitution in which one group G is constituted from two or more recesses.
  • first recess 90 is shaped after the fashion of a triangle having arcuate innermost edge 90 a which is generally congruent to the edge toward the bead region of rim protector 9 , outermost point 90 b which is toward the tread region, and two curved sides 90 c , 90 d which connect innermost edge 90 a and outermost point 90 b .
  • Second recess 91 is shaped after the fashion of a parallelogram having arcuate innermost edge 91 a which is generally congruent to the edge toward the bead region of rim protector 9 , arcuate outermost edge 91 b which is generally congruent to the edge toward the tread region of rim protector 9 , and two curved sides 91 c , 91 d which connect innermost edge 91 a and outermost edge 91 b .
  • Third recess 92 is of the same shape as second recess 91 .
  • second direction CD 2 is the direction of rotation, the direction of rotation being indicated on the tire surface.
  • FIG. 2 not less than two (three in FIG. 2 ) recesses 90 , 91 , 92 constitute one group G.
  • a plurality of groups G are arranged with uniform spaces therebetween in the tire circumferential direction CD.
  • the spaces between the plurality of groups G are of length corresponding to the angle ⁇ 1 having vertex at tire axis C 1 .
  • the plurality of groups G need not be arranged with uniform spaces therebetween. While five groups G are arranged therein in the example of FIG. 2 , so long as there are not less than two thereof, the number of groups G that are present may be varied as appropriate.
  • rim protector 9 has not less than two recesses 190 , 191 , 192 , 193 , 194 that extend toward the tread region from a location toward the bead region in such fashion as to be directed toward a location in the second direction CD 2 from a location in the first direction CD 1 in the tire circumferential direction CD.
  • These not less than two recesses 190 , 191 , 192 , 193 , 194 are arranged with spaces therebetween in the tire circumferential direction CD.
  • there are five recesses 190 , 191 , 192 , 193 , 194 in the example shown in FIG. 4 and FIG. 5 there is no limitation with respect thereto.
  • maximum depth D 1 of recesses 190 , 191 , 192 , 193 , 194 be not less than 0.5 mm and not greater than 3.0 mm.
  • a mutually adjacent pair of recesses ( 190 , 191 ) ( 191 , 192 ) ( 192 , 193 ) ( 193 , 194 ) among the plurality of recesses 190 , 191 , 192 , 193 , 194 are in a positional relationship such that they partially overlap as seen when projected onto a virtual plane VF perpendicular to the tire radial direction RD.
  • FIG. 5 a mutually adjacent pair of recesses ( 190 , 191 ) ( 191 , 192 ) ( 192 , 193 ) ( 193 , 194 ) among the plurality of recesses 190 , 191 , 192 , 193 , 194 are in a positional relationship such that they partially overlap as seen when projected onto a virtual plane VF
  • the five recesses 190 , 191 , 192 , 193 , 194 constitute one group G. It is of course also possible to adopt a constitution in which one group G is constituted from two or more recesses.
  • not less than two or not less than three (five in FIG. 4 ) recesses 190 , 191 , 192 , 193 , 194 constitute one group G.
  • a plurality of groups G are arranged with uniform spaces therebetween in the tire circumferential direction CD.
  • the spaces between the plurality of groups G are of length corresponding to the angle ⁇ 2 having vertex at tire axis C 1 .
  • the plurality of groups G need not be arranged with uniform spaces therebetween. While five groups G are arranged therein in the example of FIG. 4 , so long as there are not less than two thereof the number of groups G that are present may be varied as appropriate.
  • the plurality of recesses 190 , 191 , 192 , 193 , 194 shown in FIG. 4 and FIG. 5 are each shaped after the fashion of what appears to be a parallelogram as seen in a tire side view.
  • Second direction CD 2 is the direction of rotation, the direction of rotation being indicated on the tire surface.
  • third recess 192 , fourth recess 193 , and fifth recess 194 have serrations or first small protrusions 192 s , 193 s , 194 s that protrude from the bases of the recesses as indicated by hatching. It is preferred that the amounts by which the serrations or first small protrusions 192 s , 193 s , 194 s protrude therefrom be not greater than 20% of depth D 1 of the recess.
  • third recess 192 , fourth recess 193 , and fifth recess 194 have second protrusions 195 that extend so as to be directed toward the tread region from edge 196 toward the bead region of recesses 192 , 193 , 194 .
  • the amounts D 2 by which second protrusions 195 protrude are less than the depths D 1 of the recesses 192 , 193 , 194 . It is preferred that the amounts D 2 by which these protrude be not less than 80% of depth D 1 .
  • Second protrusions 195 are such that gaps Gp are formed between them and edge 197 toward the tread region of recesses 192 , 193 , 194 . This makes it possible for air to pass through gaps Gp during rotation and for heat dissipation characteristics to be improved.
  • a pneumatic tire in accordance with the first or second embodiment having a tread region 3 and a bead region 1 , a sidewall 2 arranged between the tread region 3 and the bead region 1 , and a rim protector 9 which is formed at the sidewall 2 and which constitutes an annular protrusion that extends in a tire circumferential direction CD.
  • the rim protector 9 has not less than two recesses ( 90 , 91 , 92 , 190 , 191 , 192 , 193 , 194 ) located within the outermost surface at the apex of the annular protrusion.
  • the not less than two recesses extend toward the tread region 3 from a location toward the bead region 1 in such fashion as to be directed toward a location in a second direction CD 2 from a location in a first direction CD 1 in the tire circumferential direction CD.
  • the not less than two recesses ( 90 , 91 , 92 , 190 , 191 , 192 , 193 , 194 ) being arranged with spaces therebetween in the tire circumferential direction CD.
  • a mutually adjacent pair(s) of recesses ( 90 , 91 ) ( 91 , 92 ) ( 190 , 191 ) ( 191 , 192 ) ( 192 , 193 ) ( 193 , 194 ) among the not less than two recesses ( 90 , 91 , 92 , 190 , 191 , 192 , 193 , 194 ) are in a positional relationship(s) such that they partially overlap as seen when projected onto a virtual plane perpendicular to a tire radial direction RD.
  • the not less than two recesses ( 90 , 91 , 92 )[ 190 , 191 , 192 , 193 , 194 ] constitute one group (G) and a plurality of the groups (C) are arranged with uniform spaces therebetween in the tire circumferential direction CD.
  • This constitution will make it possible to cause strain to be distributed uniformly in the tire circumferential direction CD.
  • not less than three of the recesses ( 90 , 91 , 92 )[ 190 , 191 , 192 , 193 , 194 ] are one group, and mutually adjacent pain of the recesses ( 90 , 91 ) ( 91 , 92 ) ( 190 , 191 ) ( 191 , 192 ) ( 192 , 193 ) ( 193 , 194 ) within each of the groups are in positional relationships such that they partially mutually overlap as seen when projected onto virtual planes (VF) perpendicular to the tire radial direction RD.
  • VF virtual planes
  • This constitution will make it possible to decrease locations at which only a thinned region is present as viewed in the tire radial direction RD, and will make it possible to decrease locations at which strain is concentrated and to cause strain to be distributed
  • At least one of the recesses ( 192 , 193 , 194 ) has serrations or first small protrusions 192 s , 193 s , 194 s that protrude from the base of the at least one recess. This constitution will make it possible to improve visual attractiveness.
  • At least one of the recesses ( 192 , 193 , 194 ) has at least one second protrusion 195 that extends so as to be directed toward the tread region from an edge 196 toward the bead region of the at least one recess, an amount by which the at least one second protrusion 195 protrudes being less than a depth D 1 of the at least one recess, and the at least one second protrusion 195 being such that a gap (Gp) is formed between it and an edge 197 toward the tread region of the at least one recess.
  • Gp gap
  • This constitution will make it possible to cause decrease in rigidity due to recesses ( 192 , 193 , 194 ) to be suppressed as a result of presence of second protrusions 195 , and will also make it possible for air to be made to pass through gaps Gp during rotation and for heat dissipation characteristics to be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
US16/704,474 2018-12-11 2019-12-05 Pneumatic tire with rim protector including plurality of recesses Active US11529830B2 (en)

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Application Number Priority Date Filing Date Title
JP2018231376A JP7170522B2 (ja) 2018-12-11 2018-12-11 空気入りタイヤ
JP2018-231376 2018-12-11
JPJP2018-231376 2018-12-11

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US11529830B2 true US11529830B2 (en) 2022-12-20

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US20040003881A1 (en) * 2002-07-04 2004-01-08 Masahiro Ebiko Pneumatic tire
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JP7170522B2 (ja) 2022-11-14
JP2020093604A (ja) 2020-06-18
US20200180360A1 (en) 2020-06-11
CN111301064A (zh) 2020-06-19

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